Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 315 AM EDT Tue Jun 11 2019 Valid 12Z Tue Jun 11 2019 - 12Z Thu Jun 13 2019 ...Excessive heat to continue building across the West... ...Strong to severe storms may develop across portions of the Plains on Tuesday... ...Heavy rains and flash flooding possible across parts of the Southeast Tuesday and Wednesday... As a strong upper level ridge continues to build, well-above normal temperatures will persist into midweek across the West. On Tuesday, temperatures are expected to reach more than 10-20 degrees above normal across much of California and the Pacific Northwest, while soaring more than 20 degrees above normal across portions of western Oregon. Heat advisories and excessive heat warnings extend south from the Portland metro region, covering large portions of western Oregon, California and parts of southern Nevada and southwestern Arizona. In addition to Portland, these warnings and/or advisories include the San Francisco, Sacramento, Las Vegas and Phoenix metro areas. These well-above normal temperatures are forecast to continue into Wednesday. By Thursday, temperatures will begin to moderate as a Pacific front pushes into the Pacific Northwest. While temperatures soar in the West, a series of cold fronts will help keep temperatures at or below normal across much of the central and eastern U.S. A cold front dropping south from central Canada into the northern Plains, along with a developing front pushing southeast across the central Plains, will be the focus for showers and thunderstorms Tuesday afternoon and evening. Some of these storms may become strong to severe, particularly across portions of Kansas, western Oklahoma and the eastern Texas Panhandle, where the Storm Prediction Center is indicating a Slight Risk for severe thunderstorms - highlighting the potential for large hail and damaging winds. Showers and storms are expected to advance farther east across the Midwest Tuesday night into Wednesday. Across the Southeast, a stalled frontal boundary will remain in place, supporting showers and thunderstorms from the eastern Gulf Coast to the southern Mid-Atlantic through Wednesday. Some of these storms may produce heavy rainfall amounts, raising flash flooding concerns. By late Wednesday, a strengthening area of low pressure will begin to draw the front along with the chance for showers and thunderstorms farther to the north through the northern Mid-Atlantic region. Pereira Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php